🪲 Translate keywords in the teacher manual

[jpelay]

In this PR I want to tackle the translation of keywords in the teacher manual. First, we need to allow the keywords to be translated using the curly brace system we use already in the adventures, that is simple enough to do and requires only the call to a function; after that we need to test the programs inside the yamls in the teacher manual, because when they do have curly braces, sometimes they're not correctly. And third, what do we do with the mess we already have?

For example in Spanish there's a mixture of several methods:

• Sometimes the keywords are directly translated

bebida = preguntar '¿Qué te gustaría beber?'
imprimir bebida
bebida = preguntar '¿Qué te gustaría beber?'
imprimir bebida
bebida = preguntar '¿Qué te gustaría beber?'
imprimir bebida

• Sometimes they have curly braces:

superhéroes = Spiderman, Batman, Iron Man
superhéroe = superhéroes {at} {random}
{if} superhéroe = Batman
    {print} '¡SOY BATMAN!'

• Sometimes they have intentional errors.
• Sometimes they have unintentional errors

Fixes #4134

How to test

[ghost]

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Legend

[jpelay]

Ok, so here's the sketch of a plan: maybe I can use a script to translate parse the correct programs, translate them to english and add the curly braces, but that leaves the question: what to do with those that have intentional errors? Perhaps first we need to add a flag to the yamls? I figured it out haha

[jpelay]

Depends on the fix made in #5175

[jpelay]

Done! All languages done with the exception of zh_Hans. I'm not sure what to do with that one since Chinese speakers don't often use spaces, which makes the parser give up. Not sure about an easy solution here.